Hollow Earth

[Anarchist Freedom]

Hollow earth I dont see how this whole idea is possible. Thoughts.

[ComradeRed]

Wouldn't that alter the inertia of the earth and cause it to fly either out of the Sun's orbit OR directly into the sun?

[encephalon]

if the earth were hollow, our gravitational field would be smaller and weaker.

[ComradeRed]

Wouldn't that mean that an asteroid's momentum could knock the earth out of orbit, viz. the astroid that some scientists believe to have killed the dinosaurs?

[NovelGentry]

if the earth were hollow, our gravitational field would be smaller and weaker.

Unless they're completely confused on the density and amount of mass between other layers.

Not saying I think it's hollow here, but you could easily hollow it out, and not affect gravity, or there could be complete misconceptions on the makeup of certain portions of it which would account for the proper mass, but different material in other places making up for the hollow part. Anyway, this thread is crap.

[ComradeRed]

If the earth were hollow that would directly affect the inertia and thereby the gravitational force. It affects the mass of the planet, which affects its relation to each other. (http://en.wikipedia.org/wiki/Gravity)

[NovelGentry]

It affects the mass of the planet, which affects its relation to each other.

How would it affect the mass though?

Are we talking if the earth IS hollow? Or if the earth was to be hollowed out?

If it is the first, it wouldn't affect the mass... because that's the way it's always been... we'd simply know now.

If it is the second, it depends where you put the matter which you remove from the center -- this is my point. And hollow to what degree? Removing matter the size of a basketball from it's center? Still hollow....

This is why this thread is crap... there was no description to as what was actually being said or implied.

Are we discussin making the earth hollow? or are we discussing if it already is hollow?

Either way, so long as the matter was redistributed evenly over the surface, I don't see how it would make a difference. The gravity is determined from the center of the object, is it not?

[ComradeRed]

How would it affect the mass though? The difference if the earth wasn't hollow to if the earth was hollow would have significantly different masses. This is what I am referring to, if the former were true the Earth would therefore be more secure, and the opposite would be true too.



Either way, so long as the matter was redistributed evenly over the surface, I don't see how it would make a difference. The gravity is determined from the center of the object, is it not? So if I had a tennis ball and covered in in a yard of concrete evenly, that would not affect the gravity of the ball?

The gravity is determined from the center of an object but is affected directly (and definitionally) by mass. If I had a cue tip, for another example, and had one side covered in lead would the cue tip still retain the same amount of gravity?

[NovelGentry]

The difference if the earth wasn't hollow to if the earth was hollow would have significantly different masses.

But not if the inner portion to that space was made up of a far more dense material than we presume it to be.


So if I had a tennis ball and covered in in a yard of concrete evenly, that would not affect the gravity of the ball?

Of course it would, you're adding mass to it.


The gravity is determined from the center of an object but is affected directly (and definitionally) by mass. If I had a cue tip, for another example, and had one side covered in lead would the cue tip still retain the same amount of gravity?

Again, no, but agian, you're adding mass, and you are adding it unevenly at that.

What I am saying is the following. If the earth was hollow like this O and assume the inner most ring was made of lead and the earth ws solid like <insert character I cannot currently produce on my keyboard that looks like a dot) and made of all the composited materials that make up every day dirt/rock -- is it not possible that the same amount of mass could be achieved? That is, the more dense material that we are unaware of, makes up for whatever we assume to be filling in the hole right now?

I&#39;m saying... the shape of an object can change without the mass changing. And unless it was lopsided where one side of the earth had significanly more mass than the other, the center point would not change.

[ÑóẊîöʼn]

There are a number of reason why the Earth can&#39;t be hollow:

1: Seismography. The Earth would sound very different to seismographs if there was an earthquake. The reason we know what we know about the inside of the earth is thanks to studies on the changes of wavelength that happen to seismic waves when they pass through the earth&#39;s crust, mantle and inner and outer cores. The Earth would ring like a bell if it was hollow. It makes a noise more akin to a &#39;thud&#39; therefore it is not hollow.

2: Formation problems. If it is assumed that the Earth was created out of the primordial disk of gas and dust that surrounded the primitive sun billions of years ago, one must ask how a hollow shape can form, as the laws of gravity state that things coalesce into objects, to which more stuff sticks to etc. This means that a partially formed hollow Earth would have been unstable. There must have been some sort of mechanism operating whereby the chunks of matter creating the Earth were prevented from collapsing into a solid sphere during it&#39;s creation. Such a mechanism has yet to be found.
If the Earth had been hollowed out sometime after it&#39;s formation, then one mast ask: Where did the spoil go? Where&#39;s the hole they would have had to draw the spoil out from? How did they prevent the sudden loss of mass cauing the earth to destabilise in it&#39;s orbit or rotation? Why hasn&#39;t the gravity suddenly reduced? Who hollowed the Earth? Why did they hollow the Earth? How do they utilise the space inside? How much space is in there? Why does the earth still have magnetism without it&#39;s molten iron core? Why hasn&#39;t the Earth collapsed? Why hasn&#39;t all the water leaked into the hollow? Where does all the magma come from? How do the tectonic plates move around? Why don&#39;t seismographs pick up the hollowness?

As you can see, the Earth is not hollow.

But Shellworlds (http://www.orionsarm.com/eg/s/Sh.html#shellworld) might be possible.

[Raisa]

I am not sure what is going on in here, and that is a shame because I am the moderator of the science forum....but the earth is not hollow and that is pretty obvious I think. How did this become an issue?

[ÑóẊîöʼn]

There are some Woo-Woos (http://www.watchingyou.com/woowoo.html) around the internet who believe that the Earth is hollow and inhabited by either lizardmen, Nordic Aliens or some other being that is concerned about the nuclear tests that humanity is carrying out. They probably want us to turn the noise down a bit.

[ÑóẊîöʼn]

See This Website (http://www.v-j-enterprises.com/holearth.html) for loads of wackiness